Study of Z Boson Production in PbPb Collisions at S(NN)=2.76 TeV.
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A search for Z bosons in the (+)(-) decay channel has been performed in PbPb collisions at S(NN)=2.76 TeV with the CMS detector at the LHC, in a 7.2 b(-1) data sample. The number of opposite-sign muon pairs observed in the 60-120 GeV/c(2) invariant mass range is 39, corresponding to a yield per unit of rapidity (y) and per minimum bias event of [33.85.5(stat)4.4(syst)]10(-8), in the |y|<2.0 range. Rapidity, transverse momentum, and centrality dependencies are also measured. The results agree with next-to-leading order QCD calculations, scaled by the number of incoherent nucleon-nucleon collisions.
author list (cited authors)
Chatrchyan, S., Khachatryan, V., Sirunyan, A. M., Tumasyan, A., Adam, W., Bergauer, T., ... CMS Collaboration.